Baseball card grade gauge



FIG. 1 is a top, front, and left side perspective view of a baseball card grade gauge showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a baseball card grade gauge, as shown and described. 